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{
Copyright (c) 1998-2012 by Florian Klaempfl and others
Generate i386 assembler for constants
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit nx86con;
{$i fpcdefs.inc}
interface
uses
node,ncon,ncgcon;
type
tx86realconstnode = class(tcgrealconstnode)
function pass_1 : tnode;override;
procedure pass_generate_code;override;
end;
implementation
uses
systems,globals,
symdef,
defutil,
cpubase,
aasmdata,
cga,cgx86,cgobj,cgbase,cgutils;
{*****************************************************************************
TX86REALCONSTNODE
*****************************************************************************}
function tx86realconstnode.pass_1 : tnode;
begin
result:=nil;
if is_number_float(value_real) and not(use_vectorfpu(resultdef)) and ((value_real=1.0) or (value_real=0.0)) then
expectloc:=LOC_FPUREGISTER
else
expectloc:=LOC_CREFERENCE;
end;
procedure tx86realconstnode.pass_generate_code;
begin
if is_number_float(value_real) then
begin
if (value_real=1.0) and not(use_vectorfpu(resultdef)) then
begin
emit_none(A_FLD1,S_NO);
location_reset(location,LOC_FPUREGISTER,def_cgsize(resultdef));
location.register:=NR_ST;
tcgx86(cg).inc_fpu_stack;
end
else if value_real=0.0 then
begin
if use_vectorfpu(resultdef) then
begin
location_reset(location,LOC_MMREGISTER,def_cgsize(resultdef));
location.register:=cg.getmmregister(current_asmdata.CurrAsmList,def_cgsize(resultdef));
if UseAVX then
begin
if is_single(resultdef) then
emit_reg_reg_reg(A_VXORPS,S_NO,location.register,location.register,location.register)
else
emit_reg_reg_reg(A_VXORPD,S_NO,location.register,location.register,location.register);
end
else
begin
if is_single(resultdef) then
emit_reg_reg(A_XORPS,S_NO,location.register,location.register)
else
emit_reg_reg(A_XORPD,S_NO,location.register,location.register);
end
end
else
begin
emit_none(A_FLDZ,S_NO);
if (get_real_sign(value_real) < 0) then
emit_none(A_FCHS,S_NO);
location_reset(location,LOC_FPUREGISTER,def_cgsize(resultdef));
location.register:=NR_ST;
tcgx86(cg).inc_fpu_stack;
end;
end
else
inherited pass_generate_code;
end
else
inherited pass_generate_code;
end;
begin
crealconstnode:=tx86realconstnode;
end.
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